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Title: HD 172189: another step in furnishing one of the best laboratories known for asteroseismic studies
Authors: Creevey, O. L ×
Uytterhoeven, K
Martin-Ruiz, S
Amado, P. J
Niemczura, E
Van Winckel, Hans
Suarez, J. C
Rolland, A
Rodler, F
Rodriguez-Lopez, C
Rodriguez, E
Raskin, Gert
Rainer, M
Poretti, E
Palle, P
Molina, R
Moya, A
Mathias, P
Le Guillou, L
Hadrava, P
Fabbian, D
Garrido, R
Decin, Leen
Cutispoto, G
Casanova, V
Broeders, Erik
Arellano Ferro, A
Aceituno, F #
Issue Date: Nov-2009
Publisher: Edp sciences s a
Series Title: Astronomy & Astrophysics vol:507 issue:2 pages:901-910
Abstract: HD 172189 is a spectroscopic eclipsing binary system with a rapidly-rotating pulsating delta Scuti component. It is also a member of the open cluster IC 4756. These combined characteristics make it an excellent laboratory for asteroseismic studies. To date, HD 172189 has been analysed in detail photometrically but not spectroscopically. For this reason we have compiled a set of spectroscopic data to determine the absolute and atmospheric parameters of the components. We determined the radial velocities ( RV) of both components using four different techniques. We disentangled the binary spectra using KOREL, and performed the first abundance analysis on both disentangled spectra. By combining the spectroscopic results and the photometric data, we obtained the component masses, 1.8 and 1.7 M-circle dot, and radii, 4.0 and 2.4 R-circle dot, for inclination i = 73.2 degrees, eccentricity e = 0.28, and orbital period Pi = 5.70198 days. Effective temperatures of 7600 K and 8100 K were also determined. The measured v sin i are 78 and 74 km s(-1), respectively, giving rotational periods of 2.50 and 1.55 days for the components. The abundance analysis shows [Fe/H] = -0.28 for the primary ( pulsating) star, consistent with observations of IC 4756. We also present an assessment of the different analysis techniques used to obtain the RVs and the global parameters.
ISSN: 0004-6361
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Information and Communication Technologies Unit
Physics and Astronomy - miscellaneous
Institute of Astronomy
× corresponding author
# (joint) last author

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